Measure warm water into a large bowl.,Sprinkle in yeast; stir until dissolved.,Add sugar, salt, 1 tablespoon caraway seed and softened margarine.,Stir in rye flour.,Beat until smooth.,Add enough white flour to make a stiff dough.,Turn out onto a lightly floured board; knead until smooth and elastic, about 8 to 10 minutes.,______,Cover, let rise in warm place, free from draft, until doubled in bulk, about 1 hour.